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This is an example of ‘Level 3’ product, mixing altimetry data. Combining data from RA-2 with other satellite-flown altimeter results like CNES’s Jason-1 and the US Navy’s GFO provides an improved space/time resolution. Here sea level is shown to a resolution of two centimeters, and higher resolution still is possible. RA-2 and Jason-1 data were designed to be especially complementary.